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New Zealand's film director Niki Caro (L) and US actress Jessica Chastain, who plays the main character, gesture during a press conference prior to the gala screening of "The Zookeeper's Wife" in Warsaw on March 7, 2017.

Hollywood actress Jessica Chastain and the female director of her new movie are celebrating both the strength and the tenderness of women.

Chastain, director Niki Caro and other actors were in Warsaw Tuesday for a gala screening of the movie "The Zookeeper's Wife."

It tells the real-life story of the World War II director of the Warsaw zoo, Jan Zabinski, and of his wife Antonina, who jointly saved up to 300 Jews, hiding them in their home on the zoo grounds and in animal enclosures, risking their own lives and those of their two children. Shot in Prague, Czech Republic, the movie opens in theaters March 31.

Two-time Academy Award nominee Chastain, who plays Antonina Zabinska, told a news conference she felt "so inspired" by the story of human kindness "that we need so much today."

She said it was exciting to play how Antonina, initially unsure of herself, "is left alone at the house and given all this responsibility for caring for all these people, and to protect them she grows into herself," until by the end of the movie she is an equal with her husband.

She said she would like to see more female heroes who are genuinely feminine and complex, rather than "Lara Croft guy-characters with sexy bodies."

Both women said they will take part in a march to mark International Women's Day in Warsaw on Wednesday. Actors Daniel Bruhl and Johan Heldenbergh, who also star in the movie, said they will join them.

Earlier in the day the crew visited the Zabinskis' villa. A gala screening preceded by a red-carpet ceremony is to take place at a cinema at Warsaw's landmark Palace of Culture and Science Tuesday evening.